Answers

2015-12-21T15:23:30+05:30


advantages-
Walking
You could not walk without the friction between your shoes and the ground. As you try to step forward, you push your foot backward. Friction holds your shoe to the ground, allowing you to walk. Consider how difficult it is to walk on slippery ice, where there is little friction.

Writing
Writing with a pencil requires friction. You could not hold a pencil in your hand without friction. It would slip out when you tried to hold it to write. The graphite pencil led would not make a mark on the paper without friction.

A pencil eraser uses friction to rub off mistakes written in pencil lead. Rubbing the eraser on the lead wears out the eraser due to friction, while the particles worn off gather up the pencil lead from the paper.

Driving car
Your car would not start moving if it wasn't for the friction of the tires against the street. With no friction, the tires would just spin. Likewise, you could not stop without the friction of the brakes and the tires.
disadvantages-Fluid friction or air resistance can greatly reduce the gas mileage in an automobile. Cars are streamlined to reduce friction. But driving at highway speeds with your windows open can create enough drag on the car to greatly reduce your gas mileage.

Heats parts
The Law of Conservation of Energy states that the amount of energy remains constant. Thus, the energy that is "lost" to friction in trying to move an object is really turned to heat energy. The friction of parts rubbing together creates heat.

Fluid friction or air resistance can greatly reduce the gas mileage in an automobile. Cars are streamlined to reduce friction. But driving at highway speeds with your windows open can create enough drag on the car to greatly reduce your gas mileage.

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please iss answer ko points me likhar bhejo na
its already in points . please see and read carefully the topic with driving car , disadvantages are given there.
  • mud
  • Helping Hand
2015-12-28T00:12:21+05:30
Advantages: 
1. Any Brakes work on the principle of friction (Clutch too) 
2. The bigger the friction, greater the traction and better the road grip of your sports car or any car for that matter. 
3. A Fluid couple is the best way of coupling two shafts, which works due fluidal friction. 
4. Friction with air makes the windmill work, a source of free energy. Also make the turbine work due to friction with water. 
5. Friction of propeller blades with water propels a boat or a ship. The same with glider and some aircraft fitted with propellers. 

Disadvantages: 
1. Resistance to the motion of an aircraft, Supercar or a Sportscar to friction with air which is called Drag in technical terms. 
2. Maximum power of an automobile engine is lost due to friction between the internal parts and only 16% is given to the wheel. 
3. Friction wears moving parts. 
4. Friction produces lot of heat which corrodes the surface of machine parts. 
5. “I broke my head but I could not find fifth disadvantage





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